Python 3.5 中的新typing
模块提供了许多用于类型注释的工具。它是否提供了封装类概念的对象或类型?功能的概念如何?
在下面定义装饰器的代码中,应该代表什么class_
?应该代表什么function
?(typing.Callable
是不够的,因为例如一个类是可调用的,但代码试图识别方法。) (模块本身的no_type_check()
装饰器typing
可能是这样行为的装饰器的原型。no_type_check()
它本身没有任何注释,类型提示或其他。)
import typing
def is_double_underscore_name (name):
return len(name) > 4 and name.startswith('__') and name.endswith('__')
# This code will not run, because 'class_' and 'function' are names that do not have any
# predefined meaning. See the text of the question.
# Note: This modifies classes in-place but (probably) does not modify functions in-place;
# this is not a considered design decision; it is just the easiest thing to do in a very
# basic example like this.
def do_something (class_or_function: typing.Union[class_, function]):
if isinstance(class_or_function, class_):
for name in class_or_function.__dict__:
if not is_double_underscore_name(name):
object = class_or_function.__dict__[name]
if isinstance(object, function):
class_or_function.__dict__[name] = do_something(object)
return class_or_function
else:
... # return the function, modified in some way